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TiredGeek · Jul 25th, 2012, 21:27

To throw another spanner in the works many people swear by adding ~300mls of two stroke oil to ~70 litres of diesel.
They say it improves mpg, gives a bit more power, makes it quieter and smokes less.
I assume it improves the cetane value a bit, or maybe it's just placebo.

I use "ordinary" Shell when I can but when I'm in Scotland the only stuff I can get is from Tesco. I've done many tanks on both and can't say I've ever noticed a difference.

I did try a few tanks of Shell V-power back to back, but on my normal daily route done at the normal times (so essentially the same traffic conditions) I found no difference whatsoever. MPG was the same to within a margin of error, no noticeable increase in power, no noticeable change to engine note or vibration.
No noticeable difference to ordinary Shell but about £5 a tank more. Not a big cost unless you do a lot of miles, but why spend it if you get nothing in return?

Jul 25th, 2012, 21:27	#30
TiredGeek Master Member Last Online: Sep 29th, 2022 20:46 Join Date: May 2007 Location: Leeds	To throw another spanner in the works many people swear by adding ~300mls of two stroke oil to ~70 litres of diesel. They say it improves mpg, gives a bit more power, makes it quieter and smokes less. I assume it improves the cetane value a bit, or maybe it's just placebo. I use "ordinary" Shell when I can but when I'm in Scotland the only stuff I can get is from Tesco. I've done many tanks on both and can't say I've ever noticed a difference. I did try a few tanks of Shell V-power back to back, but on my normal daily route done at the normal times (so essentially the same traffic conditions) I found no difference whatsoever. MPG was the same to within a margin of error, no noticeable increase in power, no noticeable change to engine note or vibration. No noticeable difference to ordinary Shell but about £5 a tank more. Not a big cost unless you do a lot of miles, but why spend it if you get nothing in return? __________________ Defected to BMW. 335d xdrive.